Uncharted 3 survival mode DLC drops March 13 - GameSpot

New co-op game type available next week as free download for Fortune Hunters' Club members, $6 otherwise; final content drop arriving next month.
Uncharted 3: Drake's Deception is a unique third-person action adventure game exclusively on the PlayStation 3 that incorporates the mechanics of a shooter and platformer-style gameplay.

Uncharted 3: Drake's Deception - Co-op Shade Survival Mode Box Shot for PlayStation 3 - GameFAQs

Co-op Shade Survival, Uncharted Wiki

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Uncharted 3: Drake's Deception - Co-op Shade Survival Mode Box Shot for PlayStation 3 - GameFAQs

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Co-op Shade Survival, Uncharted Wiki

Uncharted 4 Co-Op Mode Revealed With New Trailer; Fight Against Pirate Warlords - GameSpot